Abstract
Purpose
To assess whether vestibulo-ocular reflex (VOR) gain, posturography parameters and related clinical outcomes can improve in OSA patients after 12 months of CPAP treatment, taking into consideration that a certain degree of vestibular dysfunction has been identified in these subjects.
Methods
Vestibular, postural, clinical, and polygraphic parameters were assessed in 32 OSA patients before and after beneficial CPAP treatment by means of video head impulse test (vHIT), static posturography (SP), Dizziness Handicap Inventory (DHI), Epworth Sleepiness Scale (ESS), and Apnea–Hypopnea Index (AHI), respectively, and were compared by means of a “within-subject” ANOVA model and Spearman’s rank correlation.
Results
After the 12-month period of treatment, OSA patients demonstrated a significant reduction in AHI values, in both opened and closed eyes conditions of surface and length as well as in power spectra recorded in low, middle, and high frequency interval. Although a significant improvement was also recorded among DHI and ESS scores, VOR gain increase did not survive to post-hoc corrections. Finally, positive correlations between the differences between pre- and post-treatment AHI, ESS, and PS values were found.
Conclusions
The present work highlighted that postural instability and dizziness-related conditions due to OSA may improve after 12 months of CPAP treatment. Although VOR gain did not demonstrate significant improvement, this study might open future perspectives directed to assessing VOR gain changes after longer periods of CPAP treatment.
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Abbreviations
- AHI:
-
Apnea–Hypopnea Index
- ODI:
-
Oxygen desaturation index
- SaO2 :
-
Oxygen saturation
- lowest SaO2 :
-
Time spent with SaO2 < 90%
- vHIT:
-
Video Head Impulse Testing
- SPT:
-
Static Posturography Testing
- SP:
-
Stiff platform
- FC:
-
Foam carpet
- FFT:
-
Fast Fourier transform
- PS:
-
Power spectra of body oscillations
- DHI:
-
Italian Dizziness Handicap Inventory
- ESS:
-
Epworth Sleepiness Scale
- VOR:
-
Vestibulo-ocular reflex
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MA, AM, CL, and AV conceived and designed the experiment; AM, MA, AV, FP, FI, CL, and AL performed the experiment; AM, MA, CL, AV, and NBM analyzed the data; MA, FI, AM, CL, FP, DC, AL, and NBM contributed clinical data/materials/analysis tools; AM, MA, CL, and AV wrote the paper.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Alessandrini, M., Liguori, C., Viziano, A. et al. Postural and vestibular changes related to CPAP treatment in moderate-to-severe OSA patients: a 12-month longitudinal study. Sleep Breath 23, 665–672 (2019). https://doi.org/10.1007/s11325-018-1754-z
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DOI: https://doi.org/10.1007/s11325-018-1754-z